[Dr.IC (OP)]

what is the product of
H₂SO₄+HNO₃=  ?

[Chemistry4me]

Ooo! I was just doing that yesterday! []

HNO₃ + H₂SO₄ ↔ NO₂⁺ + HSO₄^- + H₂O

[Raghavendra]

It's a simple answer any one would have answered it....


 Answer is H2O+NO2+(-)HSO4

[lightarrow]

Yes, however the acids must be quite pure (almost no water) and H₂SO₄ must be in excess (to bind the water molecule formed in the reaction) or the very strong acid NO₂⁺ will react again with water:

NO₂⁺ + H₂O --> HNO₃ + H⁺.

[Chemistry4me]

Do you have to keep the temperature of the solution low?

[lightarrow]

Do you have to keep the temperature of the solution low?

Don't think so.

[Chemistry4me]

Higher temperature favors the dinitration product when adding nitro groups onto an aromatic ring right? Or is that just my memory playing games?

[lightarrow]

Higher temperature favors the dinitration product when adding nitro groups onto an aromatic ring right? Or is that just my memory playing games?

This is a different question.
Yes, higher T favors the nitrations but sometimes these reactions are auto-catalityc or the products can decompose in presence of the reagents, so you have to keep the T low enough if you don't want to go to hospital...

[Chemistry4me]

Okay, got that. Thanks. []

[Dr.IC (OP)]

What happens when this solution is heated?
NO2+ + HSO4- + H2O

[Chemistry4me]

What do you want to do?

[Dr.IC (OP)]

I am mixing HNO3 and H2SO4 in the ration of 4:1, and heating it to drop on IC to make the die visible (for etching plastic).

[lightarrow]

I am mixing HNO3 and H2SO4 in the ration of 4:1, and heating it to drop on IC to make the die visible (for etching plastic).

1.Why 4:1?
2.The HNO₃ is more than 98%?
3.You use that mix to dissolve plastic or what, exactly?

[Dr.IC (OP)]

This is to etch epoxy or plastic any of this...

[Chemistry4me]

Ah, finally. The answer. And some sanity too. []

[Dr.IC (OP)]

I am mixing HNO3 and H2SO4 in the ration of 4:1, and heating it to drop on IC to make the die visible (for etching plastic).

1.Why 4:1?
2.The HNO₃ is more than 98%?
3.You use that mix to dissolve plastic or what, exactly?

I dont know y v r using 4:1, and The HNO₃ is 98%

[Chemistry4me]

I dont know y v r using 4:1

Eh? Is your keyboard broken?

------

Are you trying to say: I dont know why they are using 4:1?

[Dr.IC (OP)]

I dont know y v r using 4:1

Eh? Is your keyboard broken?

------

Are you trying to say: I dont know why they are using 4:1?

i was taking about our team. our team has been trained to use the above spec.